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Discussion in 'Bubba's Outboards' started by catfishcrazyjr, Jun 20, 2006.
i have a 53-54 rude 15hp(15012) what is the fuel mix and what is the best oil to use ?
The mix is 24:1 Use any good TCW-3 oil with 87 octane or better fuel
I use super tech from wal-mart myself and I have a 53 five h/p I run every once in awhile.
My 54 model 25 Johnson says 1 quart to a six gallon tank.
That would be right and would caculate out to 24:1
Thanx Alot Guys It Is My 1st Boat And Motor And Dont Know Much
For what it's worth, I think most outboards before about 1964 used bronze bearings rather then roller bearings. That's why the fuel/oil ratio is twice what many "modern" outboards call for.
Did they even have TCW-3 oil in the 50's? My old memory seems to tell me that the 24:1 was based on 30W non detergent. Would the mix ratios be the same for TCW-3 oil?
I think the collectors use 32:1 because of what you say.
MY 40hp calls for 50 to1 I had to go 100 to 1 . At 50 it fouled the plugs with the new oils.
Charlie you still mix it at 24:1 with TCW-3 oil. Back in the fifties the oil was 30 weight and had some cotton seed oil in it and they just refined the oil and still mix it at 24:1.
Now on the other post of a 100:1 you had better bring it back to 50:1 or you will toast that engine. You can switch to a little hottor plug and gap it at 40 and it should cure your fouling problem. I would also do a decarbon job on it and see if that ain't what is causeing the fouling. If those rings get coked up and foul a lot of plugs then she is headed for disaster.
Lenorad what year is that 40?